How to interact with custom UITableViewCell class? - ios

Question

i created table view with custom UITableViewCell class. So my app should set UIStepper hidden when button in navigation bar is tapped. Than it should update count Label by Stepper's value
My app's mission to see count and list of medicines at your home. So update each medical's count when stepper at that row is tapped.
import UIKit
class MedicinesListPage: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
struct Medicine {
var name: String
var count: Int
}
var medicines = [
Medicine(name: "Парацетамол", count: 1),
Medicine(name: "Ибуфен", count: 2),
Medicine(name: "Цитрамон", count: 1),
Medicine(name: "Смекта", count: 1),
Medicine(name: "Мезин", count: 1),
Medicine(name: "Терафлю", count: 1),
Medicine(name: "Спирт", count: 1),
Medicine(name: "Бинт", count: 1),
Medicine(name: "Мукалтин", count: 1),
Medicine(name: "Стрепсилс", count: 1)
]
override func viewDidLoad() {
super.viewDidLoad()
let rightButton = UIBarButtonItem(title: "Add", style: UIBarButtonItem.Style.plain, target: self, action:(#selector(showEditing)))
navigationItem.rightBarButtonItem = rightButton
tableView.delegate = self
tableView.dataSource = self
}
#objc func showEditing(){
// should unhide stepper
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 65
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return medicines.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "medicalTableViewCell") as? medicalTableViewCell
cell?.configureCell(name: medicines[indexPath.row].name, count: medicines[indexPath.row].count)
return cell!
}
}
UITableViewCell class
import UIKit
final class medicalTableViewCell: UITableViewCell{
#IBOutlet weak var medicalName: UILabel!
#IBOutlet weak var medicalCount: UILabel!
#IBOutlet weak var stepper: UIStepper!
override func awakeFromNib() {
super.awakeFromNib()
}
#IBAction func stepperTapped(_ sender: UIStepper) {
// should update count of medicals
}
public func configureCell(name: String, count: Int){
medicalName.text = name
medicalCount.text = String(count)
}
}

Answer 1

As I understood, you have a TableViewController with customs UITableView cells.
Each cell contains medicine name, its number and the UIStepper (that allows to change the number of that medicine).
You goal is to update medicalCountLabel every time the UIStepper is tapped.
(from the conversation in the comments, this is what I implemented)
Custom UITableViewCell Class
import UIKit
class TableViewCell: UITableViewCell {
//MARK: - Properties
#IBOutlet weak var nameLabel: UILabel!
#IBOutlet weak var countLabel: UILabel!
#IBOutlet weak var stepper: UIStepper!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
//MARK: - Actions
#IBAction func stepperTapped(_ sender: UIStepper) {
countLabel.text = Int(sender.value).description
} //this is where you update `medicalCountLabel`
}
TableViewController Class:
import UIKit
class TableViewController: UITableViewController {
//MARK: - Properties
var medicines = [Medicine(name: "Парацетамол", count: 4), Medicine(name: "Ибуфен", count: 7),Medicine(name: "Цитрамон", count: 4),Medicine(name: "Смекта", count: 9), Medicine(name: "Мезин", count: 2)]
override func viewDidLoad() {
super.viewDidLoad()
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return medicines.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as? TableViewCell else{
fatalError("The dequeued cell is not an instance of TableViewCell.")
}
// Configure the cell
let medicine = medicines[indexPath.row]
cell.nameLabel.text = medicine.name
cell.countLabel.text = String(medicine.count)
cell.stepper.value = Double(medicine.count)
return cell
}
}
Medicine Class (in your case you just did it using struct which is also fine; but I created a separate swift file):
import UIKit
class Medicine{
var name: String
var count: Int
init(name: String, count: Int){
self.name = name
self.count = count
}
}

Answer 2

var medicalNames: [String] = ["item 1", "item 2", "item 3"]
var medicalCount: [Int] = [5,2,7]
This is bad design - make this an array of structs instead:
struct Medicine {
let name: String
var count: Int
}
let medicines = [
Medicine(name: "foo", count: 1), Medicine(name: "bar", count: 2)
]
Once you've done that, you can easily add a Bool flag like stepperHidden which controls whether the stepper is visible in your configureCell method. If you want all steppers to be hidden, set all flags to true and call tableView.reloadData()
Your tableView method would look like this:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "medicalTableViewCell") as! medicalTableViewCell
let medicine = medicines[indexPath.row]
cell?.configureCell(with: medicine)
return cell
}
and correspondingly,
public func configureCell(_ medicine: Medicine){
medicalName.text = medicine.name
medicalCount.text = "\(medicine.count)"
// stepper.isHidden = medicine.stepperHidden
}